Require golden fixture cutover gates

[mrjf]

Description

Require golden-fixture cutover evidence before migration completion can reach migration_score = 1.0 by enforcing three hard gates: committed golden corpus, all-Go golden replay, and no Python runtime dependency.
Also includes follow-up CI stabilization: updated tests/parity/python_contract_coverage.yml to map newly added Python tests so the Python behavior contracts parity gate and Go test workflow pass consistently.

Type of change

• Bug fix
• New feature
• Documentation
• Maintenance / refactor

Testing

• Tested locally
• All existing tests pass
• Added tests for new functionality (if applicable)

[mrjf]

@copilot fix tests

[Copilot]

@copilot fix tests

Fixed in 0fbef5d by applying Ruff formatting to tests/unit/test_crane_score.py, which resolves the failing test/lint check.

[github-actions]

Migration Benchmark Results

• Commit: e14a02833619c4893b9b177bcedd414ddfae4a41
• Run: https://github.com/githubnext/apm/actions/runs/26916361986

Migration CLI Benchmark

Max allowed Go/Python median ratio: 5.00

Command	Python median	Go median	Go/Python	Result	Return codes
--help	0.4365s	0.0012s	0.00x	359.44x faster	{'python': [0], 'go': [0]}
--version	0.4401s	0.0011s	0.00x	382.78x faster	{'python': [0], 'go': [0]}
compile --help	0.4505s	0.0012s	0.00x	371.87x faster	{'python': [0], 'go': [0]}
install --help	0.4363s	0.0013s	0.00x	344.97x faster	{'python': [0], 'go': [0]}
pack --help	0.4360s	0.0013s	0.00x	339.08x faster	{'python': [0], 'go': [0]}
audit --help	0.4338s	0.0012s	0.00x	354.97x faster	{'python': [0], 'go': [0]}
init --yes	0.4446s	0.0012s	0.00x	358.44x faster	{'python': [0], 'go': [0]}

[github-actions]

Migration Benchmark Results

• Commit: 0fbef5da10d4bc3f243166c61686e1bbcefcaa32
• Run: https://github.com/githubnext/apm/actions/runs/26916602924

Migration CLI Benchmark

Max allowed Go/Python median ratio: 5.00

Command	Python median	Go median	Go/Python	Result	Return codes
--help	0.4305s	0.0013s	0.00x	337.23x faster	{'python': [0], 'go': [0]}
--version	0.4333s	0.0012s	0.00x	361.36x faster	{'python': [0], 'go': [0]}
compile --help	0.4275s	0.0013s	0.00x	332.93x faster	{'python': [0], 'go': [0]}
install --help	0.4406s	0.0013s	0.00x	336.18x faster	{'python': [0], 'go': [0]}
pack --help	0.4471s	0.0013s	0.00x	354.24x faster	{'python': [0], 'go': [0]}
audit --help	0.4464s	0.0013s	0.00x	354.99x faster	{'python': [0], 'go': [0]}
init --yes	0.4517s	0.0013s	0.00x	353.72x faster	{'python': [0], 'go': [0]}

[mrjf]

@copilot fix tests

[Copilot]

@copilot fix tests

Fixed in c4ac5bc by updating tests/parity/python_contract_coverage.yml with the missing Python test mappings so parity/Go test gates pass again.